Click “Suggest to friends” on application profile page or “Invite to friends” on group, fan page or events page.
Right click on any friend and click “open in new tab”
You will land on a page which will only show suggestion window
At this point, paste the following code on to the address bar where the suggestion window is displaying:
select all friends then OK .
Or using chrome extension known as Facebook Invite All
After you have installed this extension you will notice a a new button “Toggle all” on the suggestion or invitation window.